Why are Halo Density Profiles Stable at Formation?
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We analyze the physical justification of the picture proposed by Salvador-Sole et al. in these proceedings for the time evolution of the universal density profile of dark-matter halos. According to this picture, halos have at formation a stable (i.e. independent of mass and time) dimensionless density profile, the characteristic length and density scales of the profile depending on the underlying cosmogony. Subsequent evolution is driven by mass accretion onto the outskirts of halos and can be characterized simply by the increment of halo radius with time and the corresponding decrease of the critical density of the universe. We find this picture to be a reasonable good description of the expected evolution of halos in hierarchical models of structure formation.
More details on the results described by Raig et al. 1998 (astro-ph/9810168) can be found in this article from a talk given at the Sesto 1998 workshop on Observational Cosmology: The Development of Galaxy Systems. Proceedings to be published in ASP Conference Series. Includes 3 eps figures and uses paspconf.sty
More details on the results described by Raig et al. 1998 (astro-ph/9810168) can be found in this article from a talk given at the Sesto 1998 workshop on Observational Cosmology: The Development of Galaxy Systems. Proceedings to be published in ASP Conference Series. Includes 3 eps figures and uses paspconf.sty